Remove universal search hooks

- Global shortcuts don't work
- Focus input on open can be achieved just with 'autofocus' attribute
- Maintaining focus when input is active can be achieved just by adding
  an ID to the input

lib/music_library_web/components/layouts/app.html.heex

@@ -118,7 +118,7 @@
   </div>
 </main>
 
-<div phx-hook="Search" id="search-global-hook">
+<div>
   {live_render(@socket, MusicLibraryWeb.UniversalSearchLive.Index,
     id: "universal-search",
     session: %{}